Also known as Soyasapogenol B glucuronide galactosyltransferase (Soyasaponin glycosyltransferase 2) (UDP-galactose:SBMG-galactosyltransferase).Glycosyltransferase that transfers a galactosyl group from UDP-galactose to soyasapogenol B monoglucuronide in the biosynthetic pathway for soyasaponins.